A237973 - OEIS

A237973

Number of (n+1) X (7+1) 0..3 arrays with the upper median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.

%I #6 Sep 11 2023 21:43:41

%S 5540337,88114176,1103412332,24232087766,564910605674,12120042669700,

%T 276807823136806,6268997867878928,141027677264715322,

%U 3177869946651172644,72112479542040048236,1614631645540094145332,36571068701325877630932

%N Number of (n+1) X (7+1) 0..3 arrays with the upper median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.

%C Column 7 of A237974.

%H R. H. Hardin, <a href="/A237973/b237973.txt">Table of n, a(n) for n = 1..77</a>

%e Some solutions for n=1

%e ..1..0..1..0..0..1..3..2....1..0..0..0..0..1..0..1....1..0..0..1..1..0..1..2

%e ..2..0..0..1..0..1..2..3....1..0..1..3..0..3..2..0....1..0..1..2..2..0..0..0

%Y Cf. A237974.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 16 2014